Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['v', 'S', 't', 'w', 'j', 'f', 'S', '5605', 'o', '9787']

22, 19, 20, 23, 10, 6, 19, 5605, 15, 9787